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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcfde8f645cff2f93b5d66fe57e244658af07a660fc114b4510867a2aa900e81' 
  AND token = 'yhdg+e284pHfC7o4nSwVAzNlVG0JIEH68mAiXqkQbNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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