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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a08ff61ad7a297953f9739d0725966ce71dc94170ece42dba29604609f24bbf0' 
  AND token = 'g65ccrsJw2n+nDLqvos1TYi9Xn7NYIZB2bg96cyOPBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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