SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85365cf1c56e1e9e0c278b2092cf8064088549aad2ef4927ab2b93a77edb8205' 
  AND token = 'F56GYKmsnvx1ewg6O+hHqvVM9LmYFyR/QbUo3gp7LpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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