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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97eb47f3c6a8762eae6221a4dca19556cfde6cba9d4b5abb8967a5c1e2fcf919' 
  AND token = 'CabtKs0kg0D4MqvrNa1/GQgH9KJcqbAnGaVc43HJ+/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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