SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c1950a9b0562d98f449c1d7b0e4f29320d55be7a9d5c0026681e2968d8be27b' 
  AND token = 'jQIuMzkKCgCrAgft5fHq2WYOrzyJ1moyH5+TXZVIRD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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