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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91ac01507504cea3988bd2a29a6231a5411e8718caedb5295cf020dc607add55' 
  AND token = 'DT8FbZUTH8D3H5OxBbQYpEM8gvIiARSnHtsRkU/GXKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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