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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00b65327d5daeae477b0a282b6200c9eee62e5434d9c8caff90858d51831cd8b' 
  AND token = 'PdR2DU25ATqSBOLqCQ+c1yULC4q8Pg0QQZ5T5fFsNTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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