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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f53e8ebf5eed6e40243aadf6ba79aa28b8f82783b0ca8183de17b24b5aea8a9' 
  AND token = 'UMGOCQMPB4RuRX9diHLmxRcoX04MpjSXQ9z39it5PHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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