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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74d877e2867c74104935b76d2fab37404a271c2f660f6b2b551b893e40410b47' 
  AND token = 'xKAgKcRdjs2fv91DlJIkmM1toZ5f9hIoHiOiHtl9jAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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