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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c6318f7f9efa1e784d1eab8a324e8d48896eb059cbd33239fe9bb7cdb91873d' 
  AND token = 'At3HSQInL7uYyz0vH2OTZzdMHn8JxbdJ5G9k6i9ldgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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