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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '250bff716ce149cb81e52a382fb677eeac912b81191b0c9ba4b32ad3db9423d9' 
  AND token = '0MDXg4EeymC+YzFzKfLO75PbtGx0N1NPz5EtaY3FdsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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