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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af17b731b92d9b9015e4643e28bd83e8cc2f592a6b080d455c6ffcab7df30b73' 
  AND token = 'UVuWnzjkXyJD1ED9iXvPfKDLEb59u6Kf0RFxlI78jxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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