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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a07d4efd0af3b0c91ac43957e8e577870267d1acc0bf4896343b830a9f35cbba' 
  AND token = 'JfQeY8582MxfzGz5MMCVv7lfJy/QZa/cRL2nsA6zd4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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