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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf16ccc70f60617d910244424422ce515be5e67d485495276c1b4858e51430d9' 
  AND token = 'AK9jrIo55Hy7EonqJEzhy0wQr/tqx0MsBvB8y2Debzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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