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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c15e54bce5fb6a2cce89f8b23b779155cc02c24c4dccef82e4fde7fef0d0472b' 
  AND token = 'hPs5Z6B9DMtSkMqIiw54a6bepwUHC7LvRlt3VtLPvDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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