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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84d5c5c90c87a8421b515449a16b9a5cd2c167eb10ca5090ce6ec70d09ca2515' 
  AND token = 'H8g5M/h42sN2tgDpnHpadCnaiLbLCsWCmBtJO9kfuoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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