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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46e35b696478a4f34e13a278a123b578026be985134670b4a905edf1fedba224' 
  AND token = 'BLwDo7DFJY7qG068x58RAJ2Q/zJx4ypckFe42hjIHmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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