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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5db7704706b2a5f41c6eed76a16e33c7dbd82cff5deac011a7632d91e60090fb' 
  AND token = 'hga80pmdfjHM4DwE5Z2jgAFyTBKTCnBftJccAfDJsAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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