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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c9d4babef406cee9868186cfe1215a5ad7676fb06a8ed8776e3ed4ebf0cd940' 
  AND token = 'KkCxRnpGyc7vSY/yTuTRW1o6DcbpSZ+cQRXOXCv8g6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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