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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19dbd65a6f6d467cc54e6dda946a9c76270a1335bdb3cb26273ff9ae77812279' 
  AND token = 'ewoZhCP6YAze5qJlzFMQvWgdnlsNc3+MdaDKJotQMTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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