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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c10e7aefccb8a89f4da5ab7614d55c77aebe3d9b996a5cccf961939328c0907' 
  AND token = 'TEglST5uGcQd5VU/ELv9JxKk6dkSjEaP5nNkDSLIbeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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