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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8d8cdaca74e4da6d49c4ba5c2647309adb24a1032daf1ae3fc79c549f6fc9ff' 
  AND token = 'HgJRUIIOnwBtMVerrm9Ulmg2XdcK6i3ZKH3Q8OI0NaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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