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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd686a4d537cb0040f1b0100a48d140ac5efa23b62e006dd32174f15b10aa8ae9' 
  AND token = '/GiNs4pmEEzbnQ2GbyTCpaRYaqNNOCZlygw4ONLNnIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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