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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0642f547d3543ea90eb7eec88f05c4d59f59250e8aabd5d7f9c518620db6c808' 
  AND token = 'ikFH2uAgzMKFI38bajURq7ADd2Jca39Bk0iJsqJ/je8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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