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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34f8f0851a59f62b826ee7e5276ed3dc231988f68bfa1b601b2ff7befda18bfb' 
  AND token = 'AcrTRUqXrm9e0K6GjwFVNnp06LAoUWav8Fp63HxKUBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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