SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd96377bd316826be67366c53d9ded131797c5865dd4192541741fe46576bdc3' 
  AND token = 'm1+BO+/Wj/jTFTVVYbprlwg+tVg9CCALm6HsyryqSMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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