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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '826adde772683a4fdbade475d778d1ea93ae5de5690eb0cea621e3dd3da4d8b5' 
  AND token = 'lWkUhzpCexJZv9BCwcalrVLfsNxQ96fWRxBvLLTFvew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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