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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f9d68e1f30b46d07c6f481a2f0c3b4b6e21ccf4c2d2c849c5eaaf44919416d7' 
  AND token = 'QNPKfOZHdGXrSgMFbQq+tN8i7lQdzioifWSLvFczMQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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