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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28d74725fc4d171d8339bcf9f7abad498216ddf0066226b58df32fe02fba7cfa' 
  AND token = '5NxCVKVRQ53Zc+O1t3yZ4QUa5SGc/I7Gb3hk00/3JLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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