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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb1eafd260eda331673bd91a5a61624608053f86ca84a7e996309ad7bd85ec30' 
  AND token = 'N1GG+RaBIDmKJ1L9HW6czo14KTfMjZcTazPJohMJo0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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