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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9990e38efb7564c60d75baf01512103d501c11e2a39845314d8e6a19dbf9e20' 
  AND token = '2T5pTgrdp3VJCwSqxgaTnstPm7WqXqk29oMqXJq6sHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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