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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3669be26fee1a6d63a047291754ea073c4a7b16694da1606c4e5ab2643105170' 
  AND token = 'XaABAwImHKYMl1yjmbaPRB3FGh9KFeSTVlo3c9+psSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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