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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '842719795dca048b672c92fbc15f5fd9d3492b64d57b806aaf9c585dbd9a4327' 
  AND token = 'n9GVtkJjGkx4XMxfp02u5il2a26S5GelKUjM4Lj+ihE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}