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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eca26479c316a69cbec98c6ae09fe349e52ed9d49313490bdbb17d1b87e8635a' 
  AND token = 'PwqAhpZYhIv36KqRd6SPd6jTkkmD4VVYjCxWdkoOa70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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