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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '843cbd58a7c37ba78e5f5ea8421c791d8a919a511682b66e4d3205e08e468a19' 
  AND token = '1S2b05+03/vm0uUev0YXo9+JRpLDCcEajcn9RWFbfwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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