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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3112e4fe86bca45f79a5929bbfe467ce002e6ccf04d66dd913e0ce371347a88d' 
  AND token = 'XKURM476/z+6ZEcjtHPq9rqI1KAp+z8cfS/560JMggM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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