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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c3ba2e265de392d16d53e4cf0e0918eadc3962a3457c0c7d50958e5bdded09c' 
  AND token = 'IzmC2Rjkg55+xrGmnP4P4XyI9mbsttjc3Gdjq0DQnuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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