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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dce76010d006a275a5614eae9f4366d18ff62e5b2ae7ca32a27434fac3cf4c5' 
  AND token = 'resjFxXJHBC4TQAjHHXxdvSyQuu4jtS5taAjOk0HOtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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