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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6591b990af233fb6988ea48502d7cd3a973ed0a98143fe231d3206607325b6ac' 
  AND token = 'LdMCVU/YYg+bZ5VYdnI+/2sIJsNlaWUA0Mor3fX3Btk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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