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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f3a94cfe9ddb42cedfc15ae7cf43bf2cfe23245d77e41c346cb1b9789728e29' 
  AND token = 'N70X8GtC3b261q/2RnT0RInUB1K98TuOiTlbbDPzDIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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