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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71505f28c20af98267d69655616f2c57198d677c5fcdeb552d9c202c03f57b86' 
  AND token = 'R/3xWg9aHiscglhggslkYF+TItPW4MBmFFBg9KClF+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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