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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4675455deb480e94e735ffccf8f4565fc112e10d225b9caa107ea8686ec22175' 
  AND token = '7JBDF3NSMDMffUB225pOKWdahk2s9FIOOsPBPrMIJ8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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