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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6082c0f8372850dc6ac3a10d2044fa7bd0bbd47cf1b67cd6a3c04a71ecaab21f' 
  AND token = '3iwXVH/Z6DLj1oUDpTINMvmHI+gn36PTuFYBfalImto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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