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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57dd12fa502cc8d6daff889d2b8898d70683968abf24cb4318d377013d53eb45' 
  AND token = 'z7Y4UIGi8dqv3ou/4d9iOyj3RMT8p0t4ZqNhUT3N2xY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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