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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46bcf59b552c9da132adbd9fdaac56e1aeba385142da4bd6ade52c88125cd26b' 
  AND token = 'qFbTNpzazUusxGigkX2p7cn/oHOI5uja9VV9OxEowV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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