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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd3ae70ea65a1c7e8ff4bd80b73a786ab84fc8160ee2b034acead55d34efeea4' 
  AND token = 'Rua4Lg66CmdNWoe7tfmc8Dr7aqxWkN/lnD7tvqpkt64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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