SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f91b89a571d71421964a9cc78f88bf43d4fb0c9ebb2647df71db0d1acd2f2d4' 
  AND token = 'Vfom+HQQHr298qQ0y7wQjKIFh/GVpInYUa9NCQz24BI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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