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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fb05cf969320695a1e6a7de613b388ab94c438ac219319131ec99d8c1bef707' 
  AND token = 'WwJ2ziDOtXImZT8iR9bO9aRPxbgP8dzhTgyNTa4CSs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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