SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '135367984c7f0cdb5ff2f35cee2bd46a707378cfe613fa5704a5c9ab70c8ffef' 
  AND token = 'gIlB4s+AHB/Dk/fSUO+JFikmv6U3VpkxAI1Gh8YTCug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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