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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccaa9ef9dabda5ab7a48b4b5a170ab61b2c517fe87d0b12effccab30d4035a61' 
  AND token = 'Zd9SkgHhxjafv5J+yrYYmDtV9+VQbZGHwZDWMP3H494=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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