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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a67b8d0a8a50e1d8f6d92a0caa7a94446fd39f74a39bdafb3dd20b2a75ce1878' 
  AND token = 'hQs/SY8xvSAWovhUshSoRQTjxzwkz5ztICw3xP0/1qQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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