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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aab483c97709bf6a0cd7236b5fbdf175116d23463cdefc08e3c5bc23ce79347' 
  AND token = 'PsuunGFoPnRjuiA7+oUXAfv2brqvtEXCKnFn3loGT34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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