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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7d502c5de95e2683dede4ab563a4715d74413b24012e3d018135d7a5f72b4f1' 
  AND token = '9U/qJn5/oY/YaT0CHc9SQKl/CO/wb+1k78b/QAF3bFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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