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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6994e287dad1cb7fad38defd48a377767a6edc29c8ae038de4cd4053d1f6ea83' 
  AND token = 'k/C5qvBmQyXHcMoIO3NaIv9Zyew1V9QF/ZsLIHLRBeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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