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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42e736ddb0505b7ee03f161a0ab173e43b8eccfb1d2a634ba3bf8e1a05a8f958' 
  AND token = 'YeKEyeFqDeO8xnIOZFvj8Z/flwarkwj5q971AJKeFv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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