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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99ca0a086f308972f4077c9ba55f090181877da7d6a4b53f93b1f1e45256e449' 
  AND token = 'D0x32bGWUMN8SfE9Snz7ToHnhAMPfrKJ51UO87oCwzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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