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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07693667ccd4828ac81a90c1e96dbbc6d00ae3905c0070016d5b480d00065027' 
  AND token = '2O5Xh8dHMbAPvJoUypz8DIP3P2zWqTk0KpVvUfkBhis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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