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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2234924b5ca204d36d52902baec25a32a08e632db14276bf4ce9b0ffaa065910' 
  AND token = 'jbN9ljQU9g30mMGien2O1MxNu+qDxZDnzFjsB3Ztgvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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