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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97036ab714ccfa9e0cf79be6e2fcee2403010864f87d9c7f356dbd1e658c67df' 
  AND token = 'Qeqzb3o/55euex3kMKYP1RflZQKlHZ/3/OTN4EZTT5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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