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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2fa69d876f04d26b0ef38143ec8acf611d3e91f5916f6dd02776c2fe1ebfdb6' 
  AND token = 'zXinhY9QM2buGssgtvbRQCouBfbKyDVVmX0IG5NTDzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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