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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76a661b3ca39de35288a17b50504c8ab81f9e1b9cda7b6ee445fea12ebf3483c' 
  AND token = 'pEK3uG20aQABKHlvEXY473mqAy7tYZxwWoix1KTeAgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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