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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f30e1b1e183c596a9dcb4b604952d2f1a43a2c80ec712b40be6070d377bb62a9' 
  AND token = 'NjtNh5teJdPmieHBuMd/HPZpta8I2TWrMWlFtTV99fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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