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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfe033bcc4a0f668ad53a071233943b901f033ed8a9d474f3438334b4cf864f4' 
  AND token = 'sdrZQyfQFxhO5lRwxQW07O9QiSTweRPd+xdDl3AqUsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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