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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3ab9469a0c335ae53e5f8b03a2bf56dae90cd197422aea03286cfc031b88e46' 
  AND token = 'YK+xMo13CUGQjINT/vPNJWgeIfUQUvQUzrzQwOoS84U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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