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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba8ada1cafc39c7694c260958ee1c7ce8f6214219e660d9b7ee37f6c2608fa56' 
  AND token = 'zNqUJiy8nODljfSFJ5AfenW3abFxMrPRp5I8I6KGRag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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