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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9c8f7e00f885e2aa8e5d9fcdc952b3ae83a0c16027521e4acf68969d73cef89' 
  AND token = 'Q63jrJzNlE3xaeIdqay8dD8EC5C2jpijt/mx7BUG1hI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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