SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d45b1cfdf5d5df7db2c7c76f9281442968c8fbfd7aa8b26d5b770442c52a343' 
  AND token = 'ecOC/HBD41R3wCCt1sSq8K5A+OipVv0VABUZUcoFAjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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