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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d8b4a0dc6c0519256d237ef3065239cc03f1b92c0cdcca1af019760bdbce3a6' 
  AND token = 'q/5NbI7KBX9c+byzcbK8fKMee7Zhll6JOXnBZ6OlTWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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