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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73d1413b064cdc93a4c824a99a4f1b949002e25df5d8109f84f1a9d95f613ad7' 
  AND token = 'ecneEddTI2p5NFOz98sm4AIB4orv+7V+Kvuxkx/ny3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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