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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0320b805664a6540937c843f952a3f53bd067784098c685f18b9a6a8fe34ac81' 
  AND token = '/HPcoP3QML7zQsNCJG5DkK5p4ZPHIzQL5yus4D7xvJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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