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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de016458190eab969cce0b505a9b608e1c520cf807b4e9ef126e31e8b289a766' 
  AND token = 'IKvCAymtH9aAHLJ0pJJ3ZL4BdkT/dB52pvO5BTXB83s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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