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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c95151d38c12d687ae357a420701454987acbe943078890e2ab91e0b2da4f077' 
  AND token = '0T7fJAy2Un9Elqt2Q1AQSQNLw7Jp3zudlAq1cosc9Fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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