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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '990c3f5ad2dac32bb69a5df2d6adbe9472ce2ddb86c56a49838ee1f0ba6c4cbd' 
  AND token = 'qfKhr2SXACA3u8ueTPG5NNE/5tfKQ/hoOu6OnGYog6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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