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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da6837ed8543ee59b23ff1627bb4f808d551fd4e22de18dfc76fb0ae9e6446f0' 
  AND token = 'WoK0UVz4578EGinPVJjliPJveem7h677eXl0oprjbHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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