SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1968104913b7902155ecc45bfd9f64f7cb6581e54ac2cdacdb208bfa0073167a' 
  AND token = 'EElyzv+4JKkvtTo5oo/LCzizigqjAdRSw4wvE8MGhWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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