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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26548ad7b86d1892ec87a853a5538b5628cf5c1165d8e9144a838e280b7b3fc6' 
  AND token = 'WrFSiOMUi7EZtMiPcJXlEkM2G0P9KoC49rUt5zgca28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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